2015 rubicon floating question

hello all!
so here in the next couple months im working on snorkeling my 15 rubi 500 dct eps irs bike! im also debating exhaust and optimizer (but thats not what this post is about) my main question is about how well these bikes float. i watch a guy on youtube by the name of christian amy, love the way his bike is set up. he is running some 31 inch outlaws, anyway i am going to be going with some 29.5 skinnies on a 14inch remington wheel. do yall think that size tire will float my bike? before i go snorkel deep and realize its not floating the front and its still getting deeper is there a way maybe put a plug in the exhaust and maybe get out there on a boat launch with some buddies to hold it upright to see how it does? maybe a second test with me on the bike (rider weight 210lbs) i imagine that would work, if yall have any other way that might work better please feel free to leave your opinoin!
Thanks!